Dealing adequately with technical uncertainties

Statistics, RAMS & Quality Management
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MTBF calculation with FIDES 2009
  MTBF-Calculation acc. to Standards
       Mil-HDBK-217
    
  Telcordia SR-332
    
  IEC-TR-62380
    
  Siemens SN 29500
    
  FIDES 2009
    
  217Plus
    
  GJB/Z 299C

Like IEC-TR-63280, FIDES 2009 has been developed by the french industry and issued in 2009.
Like 217Plus, FIDES has a unique methodology for assessing failure rates, which makes these two standards radically different from all other standards.



Traditional methodology for assessing failure rates use solely physical and technical parameters (hard parameters). This can be called a technical approach.
Apart from the technical approach, FIDES (and 217Plus) have additionally implemented a so called management approach with quite a lot of soft parameters.
Many engineers have difficulties in accepting the FIDES methodology with its soft parameters being a valid approach to reliability.

The following Ceramic Capacitor example may shed some light onto that:

FIDES asks for
Moreover, FIDES methodology  asks for
FIDES provides exhaustive questionnaires in order to assess all the required maturity levels. In fact these questionnaires form the major part of the more than 300 page FIDES standard.

From quality management perspective, and in contrast to the opinion of many engineers, this is definitely a valid and even auspicious approach, because it addresses today's main causes of unreliability better than traditional technical approaches. Reliability of today's electronic components has increased dramatically over the last decades, and therefore it is questionable to assign the root causes of component failures to weaknesses of the components themselves. Instead, today's failures are rather caused by operator misunderstanding, handling, interface problems, misuse, noncompliance with operating procedures and specifications and the like.


FIDES methodology can be compared with ISO 9001 methodology. ISO 9001 is a management standard addressing process quality. If the processes are compliant with ISO 9001 requirements, then the product quality is assumed to be in good shape.
The FIDES methodology is very similar: The better the processes, the less likely the component will fail.

Apart from the management approach, FIDES has yet another differentiator:
In addition to environment type and temperature, FIDES mission profile takes furthermore into account air pollution, air salinity and RMS vibration.

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